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// $Id:  G4RayleighAngularGenerator.hh,v 1.1 2012-12-31 18:34:15 antoni Exp $
// GEANT4 tag $Name: not supported by svn $
//
// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:  G4RayleighAngularGenerator
//
// Author:     Ivantchenko  (antoni@cern.ch, vnivanch@cern.ch)
//             modified fit formulas from Dermott E. Cullen, 
//             Nucl. Instrum. Meth. Phys. Res. B v.101, (4),499-510. 
//            
// 
// Creation date: 31 May 2012
//
// Modifications: 
//
//
// Class Description: 
//
// Class for Rayleigh Scattering angle sampling
//
// -------------------------------------------------------------------
//

#ifndef G4RayleighAngularGenerator_h
#define G4RayleighAngularGenerator_h 1

#include "G4VEmAngularDistribution.hh"
#include "globals.hh"
#include "G4DynamicParticle.hh"
#include "G4ThreeVector.hh"

class G4RayleighAngularGenerator : public G4VEmAngularDistribution
{
public:

  G4RayleighAngularGenerator();

  virtual ~G4RayleighAngularGenerator();

  virtual G4ThreeVector& SampleDirection(const G4DynamicParticle* dp,
					 G4double out_energy,
					 G4int Z,
					 const G4Material* mat = 0);
private:

  // hide assignment operator 
  G4RayleighAngularGenerator & operator=(const  G4RayleighAngularGenerator &right);
  G4RayleighAngularGenerator(const  G4RayleighAngularGenerator&);

  // static data
  static const G4double PP0[101];
  static const G4double PP1[101];
  static const G4double PP2[101];
  static const G4double PP3[101];
  static const G4double PP4[101];
  static const G4double PP5[101];
  static const G4double PP6[101];
  static const G4double PP7[101];
  static const G4double PP8[101];

  G4double fFactor;
  
};


#endif